Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11993097 | Mechanical pencil | Yusuke SANADA, Yuji Kawarazaki, Takumi Kajiwara, Tomoharu Oonishi | 2024-05-28 |
| 11446953 | Pressurized-type writing implement | Yusuke SANADA | 2022-09-20 |
| 10500891 | Mechanical pencil | Takumi Kajiwara, Atushi Ishikawa, Yuji Kawarazaki | 2019-12-10 |